Read e-book online Actors in Scala PDF

By Philipp Haller

ISBN-10: 0981531652

ISBN-13: 9780981531656

Contemporary tendencies in machine structure make concurrency and parallelism an important component of effective application execution. The actor version of concurrency permits you to exhibit real-world concurrency in a typical manner utilizing concurrent methods that speak through asynchronous messages.

Scala is a programming language for the Java digital computing device, offering first-class aid for either object-oriented and sensible programming. by means of together with a robust actor framework in its normal library, Scala deals a compelling method of take on concurrent programming. Scala's actors allow you to practice the actor concurrency version to the JVM, allowing real-world suggestions which are effective, scalable, and powerful.

Published by way of Artima, this can be the 1st e-book on Scala's actors, co-authored by way of the writer and lead maintainer, Philipp Haller, and Frank Sommers. beginning with the basics of the actor concurrency version, this booklet deals a accomplished educational on sensible programming with actors in Scala. It helps you to leverage the total strength of state-of-the-art and tomorrow's multi-core processors by means of describing either easy and complicated beneficial properties of Scala's actor framework in-depth.

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Extra resources for Actors in Scala

Example text

Instead, we need a way to combine the s❧❡❡♣ method with the code that should run after the ✬❆✇❛❦❡ message has been received without changing the implementation of s❧❡❡♣. That is where the control-flow combinators of the ❆❝t♦r object come into play. These combinators allow expressing common communication patterns in a relatively simple and concise way. The most basic combinator is ❛♥❞❚❤❡♥. The ❛♥❞❚❤❡♥ combinator combines two code blocks to run after each other even if the first one invokes r❡❛❝t.

Event-based actors are implemented as event handlers instead of as threads, and are therefore more light-weight than their thread-based cousins. Since event-based actors are not tied to Java threads, event-based actors can execute on a pool of a small number of worker threads. Typically, such a pool should contain as many worker threads as there are processor cores in the system. That maximizes parallelism while keeping the overhead of pool threads– memory consumption and context-switching–to a minimum.

The Scala actors library also provides a shorthand for defining and starting an actor in a single step without extending the ❆❝t♦r trait. 4 shows how to write the above code using the shorthand notation. Handling subscription messages Upon receiving a ❙✉❜s❝r✐❜❡ message, a ❈❤❛t❘♦♦♠ must add the user to its subscribers session. 4 · Creating and starting an actor with ❛❝t♦r scribers in a list of ❯s❡rs. Note, however, that subscribers must be able to receive messages from the chat room. In our current design, when a ❯s❡rP♦st arrives, ❈❤❛t❘♦♦♠ iterates through its subscribers session, and sends the message’s content to all subscribing users, except to the user sending the message.

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Actors in Scala by Philipp Haller

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